Receiving apparatus.



' F. w. MIDGLEY.

RECEIVING APPARATUS.

APPLIUATIOH FILED H2335, 1909. RENEWED SEPT. 80, 1910.

Patented Nov. 8, 1910.

4 i :9 IIVEIIR B! a s 16L mum Inutsszs UNITED STATES. PATENT Oregon.

I?REZDIERICIK W. MIDGLEY, 0F JERSEY TY, NEW JEBSEY,- ASSIGNOR TO INT TIOilQ'AL TELEGRAPH CONSTRUCTION MPANY, A CORPORATION OF NEW YO K.

RECEIVING APPARATUS.

974,985. Specifics 1 v originalapplicatlon filed January 26, 1906, Serldl 120. 297,957. .Dtvided and this application filed February 11 of Letters Patent.

25, 1903, Serial 80.179918. Renewed September 30, 1910. Serial No. 584,764.

To all whom it may concern:

Be it known that I, FREDERICK W. Mino- LEY a citizen of the'United States, residing at erse City, in the county of Hudson and State 0 New Jersey, have invented a new and useful Receiving Apparatus, of which the following is a specification.

My invention relates to electrical signaling systems wherein the message is repre sented during transmission by electro-radiant energy transmitted througlr'the natural media.

My invention resides in the receiving apparatu's employed in such si aling systems, and has for its object the se ective reception of signals.

In some localities reception of signals is rendered difficult because of numerous false signals caused by atmospheric or static electricit or other natural electrical effects.

It is the object of my invention to render receiving apparatus indifi'erent to such effects as well as to render the receiving apparatus highly selective of only 'those messages intended to be received by it. To this end, I provide a looped aerial conductor,

which is closed through suitable frequency determining elements or tuning elements, and in. inductive relation with the looped aerial circuit is associated a circuit containing a condenser and wave-responsive device serially connected, or such wave-responsive.

device and serially connected condenser connected irl shunt to another condenser.

This application is a division of my prior application Serial No. 297,957, filed January 26, L906.

For an illustration of some of the forms my invention may take, reference is to be had to t e accomp ying drawing, in which: Figu 1 is a diagrammatic view of a looped aerial conductor, the wavesresponsive device being iii a circuit inductively, related to the loopeda'erial conductor. Fig. 2 is a diagrammatic view of a looped aerial conductor with an inductively associated circuit including a wave-responsive device. In Fig. 1 of the drawing, A re resents a are legs a 100 ed aerial conductor having an a connected together at their upperends and spread apart a distance ofprac- -that the condenser C of Fig. 1 1s omitted. Here, again, high selectivity is obtained tically one-fourth the length of the wave transmitted from the station with which the apparatus is to coiiperate. the legs of the 100 may, however, be greatly varied from this ractlon without departing from the spirit of my invention. The 1e of the loop are connected together at their bases through the adjustable condenser C and the inductance L, which forms also the primary of an oscillation transformer, whose secondary is L. Obviously, L and L may both be ad'ustable.

L and are frequency determiningv elements or tuning elements for tuning the loop A and for closing the circuit of the.

and the adjustable con- The spread of connected the wave-reas hererepresented, requires no local battery, as, for example, a rimary cell detecfor. By adjusting L or or both, the loop A is tuned; andby adjusting C and K very sharp selectivity is'obtained.

As thus far described, the looped aerial conductor ie ungrounded, and when ungrounded serveswell for selective reception and for minimizin the effects of static, atmospheric, or ot en, natural electricity. However, the loop A may be connected to earth G either through the condenser K or through-the condenser Ci, both condensers being adjustable or variable. This is accomplished by closing either switch a or the switch 8.

In Fig. 2, the partsare the same, excep when the loop is ungrounded by adjustment of L and C, Land K. Or the loop ma be connected to earth G through either condenser K or condenser C" by closing either switch s or switch 8.

From the foregoing description, it is apparent that my invention covers the looped aerial conductor and associated inductive circuit either when the loop is ungrounded or rounded at either side of the condenser an inductance in the loop.

What I claimis:

1. Ina wireless signaling system, a looped aerial conductor, capacity and inductance connected in said loop to form a closed circuit, said closed} circuit forming a single path through a 1' theinductance in series, a circuit in vindu ive relation with said loop,

and a wave responsive device and a condenser serially connected in ,said associated circuit.

2. In a wireless signaling system, a looped aerial conductor, frequency determining elewave-respons ve device connected in a path in parallel to said condenser.

4. In a wireless signaling system, a looped aerial conductor, freqnencydeterniining ele aerial conductor, frequency 'inents of different kinds connected in said merits of different kinds connected in said loop to form a closed circuit, a circuit in inductive relation to said loop, a condenser in said inductively related circuit, a waveresponsive device connected in a path in parallel to said condenser, and a connection from said looped aerial conductor to earth through, another condenser.

5. In a wireless signaling system, a looped determining eleloo -to form a closed circuit, a circuit in in uctive relation with said loop, a condenser in said inductively related circuit, and a WflVB-IBSPOHSlVQ'dGVlCG and condenser serially connected in shunt to said condenser.

6. In a wireless'signaling system, a looped aerial conductor, frequency determining elements of different kinds connected in said loop to form a closed circuit, a circuit in in-' ductive relation with said loop, a condenser in said inductively related circuit, a wavesmears responsive device and condenser serially connected in shunt to said condenser, and a conmotion from said looped aerial conductor to earth through another condenser. 7. In a wireless signaling system, a looped aerial conductor, a circuit in inductive relation therewith, a condenser in said inductively related circuit, and a wave-responsive device and a condenser shunt to said condenser.

8. In a wireless signalin system, a looped aerial conductor, a circuit 11 inductive relation therewith, a condenser in said inductively related circuit, a waveresponsive device and a condenser serially connected in shunt to said condenser, and a connection from said looped aerial conductor to earth through another condenser.

9. In a wireless signaling 5 stem, a looped aerial conductor, capacity an inductance included in said loop to form a closed circuit, means for connectin said loop to earth from a. terminal either 0% said inductance or of said condenser, a circuit in inductive relation to said loop, and a wave-responsive device connected in said inductively related circuit.

10. In a wireless signaling system, a looped aerial conductor, capacity and inductance included in said loop to form a closed circuit, means for connecting said loop to earth from a terminal either of said inducductive relation to said loop, and a waveresponsive device and condenser connected in said inductively relatd circuit.

11. In a wireless signaling system, a looped aerial conductor, capacity and induc tance included in said loop to form a closed circuit, means for connecting said loop to earth from a terminal either of said inductance or of said condenser, a circuit in inductiv'e relation to said loop, a condenser included in said inductively related circuit, and a wave-responsive device and a condenser connected in shunt to said condenser.

In testimony whereof I have hereunto aflixed my signature in the presence of the [two subscribing witnesses.

) FREDK W. MIDGLEY.

E. D. HoLLENBEcK.

tance or of said condenser, a circuit in 111- serially connected in 

